Thermal Performance, Beautiful Views

Earning the top rating from both Natural Resources Canada and the U.S. Department of Energy, fiberglass windows are the most energy efficient windows available today. Accurate Dorwin created the world’s first fiberglass window in 1983 and has manufactured and installed these ultra-energy efficient windows ever since. Because of their highest ER ratings and lowest U-values, Accurate Dorwin fiberglass windows are the top choice of green building professionals. Enjoy the energy savings and beauty of fiberglass—the fastest growing window frame of choice in North America.

Saving Energy is Beautiful

Earning the top rating from both Natural Resources Canada and the U.S. Department of Energy, fibreglass windows are the most energy efficient available today.

If you’re new to fibreglass, this is the environment to learn. Accurate Dorwin created the world’s first fibreglass window in 1983, and has manufactured and installed these ultra-energy efficient windows ever since. From the highest ER ratings and lowest U-values, Accurate Dorwin fibreglass windows are the top choice of green building professionals. Enjoy and catch up, as fibreglass has become the fastest growing window frame of choice in North America.

Why Fiberglass

Superior Thermal Performance and More Beautiful Views

Energy Efficiency

The best performance

Fiberglass windows are the most energy efficient windows on the market. Superior thermal performance means less money spent on heating and cooling your residence or workplace.